- The definition of ay is a word used to show sorrow or upset.
An example of ay used as an interjection is in the sentences, "Ay! I can't believe he was late for school again!"
ay definition by Webster's New World
ay definition by American Heritage Dictionary
noun & adv.
Variant of aye
Origin: Middle English ai, ay ; from Old Norse ei ; from Indo-European base an unverified form aiw-, vital force from source age